Kanye West -- Basketball So Hard

Kanye West hit the gym in Australia Thursday -- challenging some friends to a pickup basketball game ... but he wasn't rockin' Jordans (Game 6) ... Yeezy strapped on some Adidas.

After his relationship with Nike soured, Kanye signed a deal with the rival shoe giant last year -- and though he hasn't released his own Adidas shoe yet, he's already supporting the brand in public.

These happen to be the Adidas "Pure Boost" running shoes ... not ideal for basketball, but they seem to be working for K.

Fun Fact -- Kanye's "Red October" Nike shoes run as much as $5k on eBay.